没有变量名的$ _GET [关闭]

Question

Many times I tried to write different types of codes in different languages. When I tried to write something like this:

if (!isset($_GET[""])) $_GET[""] = false;

The compiler does not report an error. OK, we have this construction without variable name. Is here one way to use this construction in practice? I think it's nonsense.

I think that only $_GET is usable in practice, like:

if (count($_GET) > 0) do something

Answer 1

empty($_GET) and count($_GET) are working here for me!